Best Diadematid
Pseudodiadema hemisphaericum is an extinct species of regular sea urchin placed in the genus Pseudodiadema and the family Pseudodiadematidae. Like other regular echinoids, it had a broadly radial body plan rather than the bilateral form seen in heart urchins and related irregular groups. The organis...
Why this score?
Recognized Jurassic regular echinoid, solid fossil reputation but less distinctive than some cidaroids.
Scoring methodology
Lissodiadema lorioli is a species of sea urchin in the family Diadematidae, characterized by its long, slender, and distinctively fine spines.
Why this score?
Obscure diadematoid with narrow taxonomic footprint and limited public or ecological reputation.
Scoring methodology
Centrostephanus tenuispinus is an Australian diadematid sea urchin described by H. L. Clark in 1914. It is known as the western hollow-spined urchin and belongs to a group recognized for long, slender spines and a distinctive open appearance. The species is a living marine invertebrate of the wester...
Why this score?
Niche Centrostephanus species with limited public and applied profile; mostly specialist taxonomic and regional ecological interest.
Scoring methodology
Centrostephanus sylviae is a Chilean diadematid sea urchin described by Koehler in 1975, notable as a South Pacific member of Centrostephanus.
Why this score?
Obscure Centrostephanus taxon, low aggregate visibility outside specialist echinoid literature.
Scoring methodology
